电渣重熔体系内熔渣流场的数学模拟

建立了电渣重熔体系内电磁力作用下熔体流场的数学模型，并将其应用于在结晶器直径为２００ｍｍ的实验室装置上以ＣａＦ_２＋３０ｍａｓｓ％Ａｌ_２Ｏ_３＋２０ｍａｓｓ％ＣａＯ系熔渣进行的低碳低合金钢重熔过程（电极直径７６ｍｍ，３０００Ａ（ｒｍｓ））。合理选取模型参数值，计算了电磁力作用下体系内渣池的流场。结果表明，在电磁力作用下，渣池内形成沿结晶器壁向上，经熔渣自由表面和电极端部锥面又沿体系对称轴向下流动的两个旋涡，最大流速区约位于渣池内体系对称轴中部，涡心基本上位于半渣池中央略偏左、右下方的区域。对一些假想工况下的情形作了模拟，考察了重熔电流、填充比和电极端部形状对重熔体系内渣池流场的影响。与一些物理模拟结果作了比较。

MATHEMATICAL MODELLING OF SLAG FLOW FIELD IN ESR SYSTEM

On the basis of the mathematical model of the magnetic field proposed by the authors, a mathematical model for the electromagnetically driven component of the flow field of the melts in ESR system has been developed and applied to the laboratory unit with a mould of 200 mm in diameter. For the practical remelting of a low carbon low alloy steel used an electrode of 76 mm in diameter with 3000 A(rms) current and CaF_2 30mass% Al_2O_3 20mass% CaO slag system, the flow field in the slag bath has been computed using the parameters selected reasonablly. The results indicate that two vontexes are generated in the bath, which circulatively move upwards along the inside wall of mould and through the slag/gas interface and the conical electrode tip, then downwards along the symmetry axis of the system. The maximum velocity of the moving slag reaches approximately at the middle part of the axis in the bath. Also, modelling and simulating under the assumed operative con ditions have been carried out in order to consider the influence of the remelting current and fill ratio, as well as the shape of electrode tip. (